With apologies to my my malignantly compact 12 lane main bus, which I will not spend the effort to space out on account of my 25 hours Space Exploration save still being a "starter base".
In the beginning I build personal production for gears and green chips and just build from those and plates.
I dont build a proper mall until I can build a botmall, so what ends up happening is the assemblers that build the bots and repair packs are just next to the mall's roboport. So I also get the repair packs from the mall, it's just the same source.